I don't know how dividends work with most other altcoins but if I buy it on an exchange it seems crazy that I would have to manually register the coin to get the dividend. I have no problem with giving my info but in would have no idea how to go about doing that and would never even know I had to do that if I had not read it here.
It will be a simple process to receive your dividend. You will go to rhinocoin.org/dividend when the IPO is complete and submit your RhinoCoin address as you do on the IPO homepage. Your dividends will automatically be paid out to that RhinoCoin address based on it's balance.